| OLD | NEW |
|---|
| (Empty) |
| 1 <!doctype html> | |
| 2 <html> | |
| 3 <head> | |
| 4 <script src="../resources/js-test.js"></script> | |
| 5 <script src="resources/compatibility.js"></script> | |
| 6 <script src="resources/audit-util.js"></script> | |
| 7 <script src="resources/audio-testing.js"></script> | |
| 8 <title>Test Negative AudioParam.exponentialRampToValueAtTime</title> | |
| 9 </head> | |
| 10 | |
| 11 <body> | |
| 12 <script> | |
| 13 description("Test AudioParam.exponentialRampToValueAtTime() with Negative
Values."); | |
| 14 window.jsTestIsAsync = true; | |
| 15 | |
| 16 var sampleRate = 48000; | |
| 17 | |
| 18 var audit = Audit.createTaskRunner(); | |
| 19 | |
| 20 audit.defineTask("both negative values", function (done) { | |
| 21 var renderDuration = 0.125; | |
| 22 | |
| 23 // Create context with two channels. Channel 0 contains the positive-va
lued exponential and | |
| 24 // channel 1 contains the negative-valued exponential. We'll compare th
e two channels to | |
| 25 // verify that they're the same, as they should be. | |
| 26 var context = new OfflineAudioContext(2, renderDuration * sampleRate, sa
mpleRate); | |
| 27 var source = context.createBufferSource(); | |
| 28 source.buffer = createConstantBuffer(context, 1, 1); | |
| 29 source.loop = true; | |
| 30 | |
| 31 // Gain node gp is for the positive-valued exponential ramp, and gn is f
or the negative-valued | |
| 32 // exponential ramp. | |
| 33 var gp = context.createGain(); | |
| 34 var gn = context.createGain(); | |
| 35 var merger = context.createChannelMerger(2); | |
| 36 | |
| 37 source.connect(gp) | |
| 38 .connect(merger, 0, 0); | |
| 39 source.connect(gn) | |
| 40 .connect(merger, 0, 1); | |
| 41 merger.connect(context.destination); | |
| 42 | |
| 43 gp.gain.setValueAtTime(1, 0); | |
| 44 gp.gain.exponentialRampToValueAtTime(2, renderDuration); | |
| 45 | |
| 46 gn.gain.setValueAtTime(-1, 0); | |
| 47 gn.gain.exponentialRampToValueAtTime(-2, renderDuration); | |
| 48 | |
| 49 source.start(); | |
| 50 | |
| 51 context.startRendering().then(function (resultBuffer) { | |
| 52 // Verify that channels have the same values, except for the sign. | |
| 53 var expected = resultBuffer.getChannelData(0); | |
| 54 var actual = resultBuffer.getChannelData(1); | |
| 55 var inverted = expected.map(sample => -sample); | |
| 56 | |
| 57 Should("Negative exponential ramp from -1 to -2", actual) | |
| 58 .beEqualToArray(inverted); | |
| 59 }).then(done); | |
| 60 }); | |
| 61 | |
| 62 audit.defineTask("negative-end", function (done) { | |
| 63 // Positive start value and negative end value should just do nothing. | |
| 64 var renderDuration = 0.125; | |
| 65 var context = new OfflineAudioContext(1, renderDuration * sampleRate, sa
mpleRate); | |
| 66 var source = context.createBufferSource(); | |
| 67 source.buffer = createConstantBuffer(context, 1, 1); | |
| 68 source.loop = true; | |
| 69 | |
| 70 // Gain node gp is for the positive-valued exponential ramp, and gn is f
or the negative-valued | |
| 71 // exponential ramp. | |
| 72 var g = context.createGain(); | |
| 73 | |
| 74 g.gain.setValueAtTime(2, 0); | |
| 75 g.gain.exponentialRampToValueAtTime(-1, renderDuration); | |
| 76 | |
| 77 source.connect(g) | |
| 78 .connect(context.destination); | |
| 79 | |
| 80 source.start(); | |
| 81 | |
| 82 context.startRendering().then(function (resultBuffer) { | |
| 83 var actual = resultBuffer.getChannelData(0); | |
| 84 | |
| 85 Should("Exponential ramp from 2 to -1", actual) | |
| 86 .beConstantValueOf(2); | |
| 87 }).then(done); | |
| 88 }); | |
| 89 | |
| 90 audit.defineTask("positive-end", function (done) { | |
| 91 // Positive start value and negative end value should just do nothing. | |
| 92 var renderDuration = 0.125; | |
| 93 var context = new OfflineAudioContext(1, renderDuration * sampleRate, sa
mpleRate); | |
| 94 var source = context.createBufferSource(); | |
| 95 source.buffer = createConstantBuffer(context, 1, 1); | |
| 96 source.loop = true; | |
| 97 | |
| 98 var g = context.createGain(); | |
| 99 | |
| 100 g.gain.setValueAtTime(-1, 0); | |
| 101 g.gain.exponentialRampToValueAtTime(1, renderDuration); | |
| 102 | |
| 103 source.connect(g) | |
| 104 .connect(context.destination); | |
| 105 source.start(); | |
| 106 | |
| 107 context.startRendering().then(function (resultBuffer) { | |
| 108 var actual = resultBuffer.getChannelData(0); | |
| 109 | |
| 110 Should("Exponential ramp from -1 to 1", actual) | |
| 111 .beConstantValueOf(-1); | |
| 112 }).then(done); | |
| 113 }); | |
| 114 | |
| 115 audit.defineTask("propagate", function (done) { | |
| 116 // Test propagation of ramp if the exponential ramp start and end values
have opposite sign. | |
| 117 var renderDuration = 0.125; | |
| 118 var linearRampEnd = renderDuration / 4; | |
| 119 var exponentialRampEnd = renderDuration / 2; | |
| 120 | |
| 121 var context = new OfflineAudioContext(1, renderDuration * sampleRate, sa
mpleRate); | |
| 122 var source = context.createBufferSource(); | |
| 123 source.buffer = createConstantBuffer(context, 1, 1); | |
| 124 source.loop = true; | |
| 125 | |
| 126 var g = context.createGain(); | |
| 127 | |
| 128 g.gain.setValueAtTime(2, 0); | |
| 129 g.gain.linearRampToValueAtTime(-1, linearRampEnd); | |
| 130 g.gain.exponentialRampToValueAtTime(1, exponentialRampEnd); | |
| 131 | |
| 132 source.connect(g) | |
| 133 .connect(context.destination); | |
| 134 source.start(); | |
| 135 | |
| 136 context.startRendering().then(function (resultBuffer) { | |
| 137 var actual = resultBuffer.getChannelData(0); | |
| 138 | |
| 139 // Since the start value of the exponential ramp is -1 and the end val
ue is 1, the ramp | |
| 140 // should just propagate -1 from the end of the linear ramp "forever". | |
| 141 var endFrame = Math.ceil(linearRampEnd * sampleRate); | |
| 142 Should("Exponential ramp from -1 to 1 after the end of the linear ramp
", | |
| 143 actual.slice(endFrame)) | |
| 144 .beConstantValueOf(-1); | |
| 145 }).then(done); | |
| 146 | |
| 147 }); | |
| 148 | |
| 149 audit.defineTask("finish", function (done) { | |
| 150 finishJSTest(); | |
| 151 done(); | |
| 152 }); | |
| 153 | |
| 154 audit.runTasks(); | |
| 155 </script> | |
| 156 </body> | |
| 157 </html> | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 2581463002:
Refactor WebAudio test directory (Closed)
